Preface Firefox lacks in many aspects Chromium does very well regarding handling of Pen/Touch Input, Tablet PC UX. This needs to change for good. Over the past five years, annual sale of touchscreen laptops have risen from estimated 17% to 25%. Tablet PC form factor and touchscreen laptops are ever increasingly becoming more popular. Next MacBook is rumored to release with a touchscreen which could make the trend accelerate further. Firefox is not prepared. List of Issues I have Observed - DND (Drag 'n Drop) Support Can't drag tabs, sidebar separator/divider line, downloaded items from download menu https://bugzilla.mozilla.org/show_bug.cgi?id=1692072 - Can't select text by dragging while holding down pen/stylus right click (barrel) button This is a platform behavior that's not supported by Firefox, but is supported by Chromium "Selection with pen. We also revised selection with pen by giving it more control over the selection process. Not only are we showing selection grippers whenever text is selected via pen, but also are allowing for a consistent and fast selection of content – text, objects, or ink—by dragging the pen while the barrel button is pressed." (https://blogs.windows.com/windows-insider/2017/06/08/announcing-windows-10-insider-preview-build-16215-pc-build-15222-mobile/) - Flick gestures can't be activated with Pen/Touch input History Back/Forward flick (swipe) gestures that are available to trackpads are not available for pen/stylus, touchscreen usage. - Pinch to zoom is not as polished as Chromium implements Pinch to zoom using touchscreen on Firefox feels as if your finger movements correspond to sliding vertical/horizontal scrollbars to move webpage instead of directly moving the content like a dragging motion (i.e. Direct Manipulation). The zoom gesture needs refinements to match Chromium implementation. I have observed that some software (e.g. Tablet Pro Zoom) which add system wide custom touchscreen gestures interfere with Firefox's zoom gesture so as to make it not function at all whilst the same doesn't happen on Chromium browser. - Some of the buttons in Screenshot UI are not clickable with Pen/Touch input
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